Variance of the random variable X is
(a) E(x²) – [E(x)]²
(b) [E(x)]² – E(x²)
(c) E(x²)
(d) [E(x)]²
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Hi ,
The variance is a measure of how
spread out the value of X would be if
the experiment leading to X were
repeated a number of times .
The variance of X , written as Var( X )
is given by :
******************************************
Var( X ) = E( X² ) - [ E( X ) ]²
*******************************************
Where E( X ) is expected value of X.
Option ( a ) is correct.
I hope this helps you.
: )
The variance is a measure of how
spread out the value of X would be if
the experiment leading to X were
repeated a number of times .
The variance of X , written as Var( X )
is given by :
******************************************
Var( X ) = E( X² ) - [ E( X ) ]²
*******************************************
Where E( X ) is expected value of X.
Option ( a ) is correct.
I hope this helps you.
: )
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